Keep on rolling

You've Found some success in your life, but luck has never played a part in it. when you find you stride you don't like to let it stop.

After taking this feat whenever you roll a critical success on D20 you gain advantage on your next non-combat roll or check that uses a D20 (This effect extends to Death saving rolls)

If you roll a critical success on a roll using the advantage from this feat it applies to the next 2 rolls and loses this effect until the next long rest.

Addendum(AT DM'S DISCRETION)

if you attempt to convince your DM to allow you to use this Feat for advantage on a combat roll this Feat becomes the unlucky feat until the end of the current session

Unlucky

You have 3 unluck points. Whenever you roll a critical on an attack roll, an ability check, or a saving throw, you expend one luck point to roll an additional d20.

You regain your expended unluck points when you finish a long rest.